Is logging working fine?

Trying to diagnose my other problem (cannot add remote contacts), I noticed that there’s a debug log message in OutgoingSessionPromise that logs precisely the cause of the error I’m seeing. Unfortunately, that message is nowhere to be found, even when debug logging us turned on. PluginManager also uses slf4j and the debug messages in there are visible in debug.log.

I know the code is being executed, because I have backed log messages with System.out.println(…) and, surely enough, these are getting into nohup.out

What gives?